施工过程中柱轴压作用对开洞薄板墙的受力影响分析

Effects on Structural Behavior of Steel Plane Shear Wall(SPSW) with Opening Considering Axial Compression of the Column During Construction

我国现阶段采用薄钢板剪力墙体系的大多数建筑均采用薄钢板剪力墙仅承受侧向水平荷载的设计理念,在设计中未考虑内填板的安装与结构主体同步或稍滞后安装而产生的轴向预压力作用的影响。研究指出在施工状态下开洞薄板墙外边柱的最大层间压缩比约为1/500,以此为依据建立有限元模型,通过内填板有、无预压力两种情况的荷载位移曲线的比较发现,由施工顺序不同引起预压力作用对开洞薄板墙受力性能的影响较小。以开中洞薄板墙为例建立一单榀12层有限元模型,考虑由于施工顺序的不同引起的轴向预压力对开洞薄板墙的影响,进行罕遇地震的时程分析。分析结果表明,结构最大侧向位移与层间位移角均满足设计要求。

With the design concept that SPSW only resisting lateral horizontal load, pre-pressure produced in most buildings of SPSW in our country for the filling plates installed in the same time with main structure or lagged slightly which might cause considerable effects on the loading ability of thin wall is ignored in design. The authors focuse on the influence of axial load on the performance of SPSW. Firstly, under the state of construction, the maximum interlayer pression ratio of 1/500 of outside frame column in SPSW with opening is gained through detailed theoretical analysis. Based on that, finite element models are set up to obtain the load-displacement curve under states of with or without pre-pressure. By comparison, it is found that the effect is small if pre-pressrue is produced by different construction process. Then, a piece of thin-wall with center opening is taken to set up a group of FEM of 12-storey single frame. Considering the effect to loading of SPSW mentioned before, the time history analysis under rare earthquake is analyzed. It is found that both the maximum lateral displacement and story drift angle satisfy designing requirement.